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It has traditionally been difficult to recognize phonemes, and therefore spoken words, from different speakers using computers. This article describes a means for overcoming this problem.
English (United States)
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Phoneme Recognizer Using Format Patios
It has traditionally been difficult to recognize phonemes, and therefore
spoken words, from different speakers using computers. This article describes a
means for overcoming this problem.
Human speech output concentrates energy into areas of the frequency
domain. These energy peaks are commonly called formants and are usually
concentrated in the region from 500 Hz to 4 kHz. The ratio of the first two
formants over time provides a signal which can uniquely identify the spoken
sound. These formant ratios are inherently frequency normalized with respect to
the base tone without extracting the voice pitch. To obtain the formant ratios, the
first two formants must be extracted from the utterance.
It is known that the first formant is found in the range of 200 to 850 Hz. For
this reason, the peak with the highest energy and with a frequency less than 850
Hz and greater than 200 Hz is identified as the first formant. The second formant
is identified as the highest energy peak in the frequency range 850 to 3000 Hz.
All other peaks are discarded except where the largest, in terms of amplitude, is
greater than 3000 Hz; then, the sampling interval is identified as being unvoiced.
Referring to Fig. 1, the voice input, after amplification, is
fed into input filter 1 which provided an increasing gain of 12 dB
per octave to approximate the human voice perception system response.
The output of the input filter is fed into a bank of comb fil...